Hi
I am having problem with UI, it appears black partly. I have 4k monitor.
In console appears:
Qt Warn: Warning: QT_DEVICE_PIXEL_RATIO is deprecated. Instead use:
QT_AUTO_SCREEN_SCALE_FACTOR to enable platform plugin controlled per-screen factors.
QT_SCREEN_SCALE_FACTORS to set per-screen factors.
QT_SCALE_FACTOR to set the application global scale factor.

I tried to reinstall houdini, delete the preferences in Documents, reinstall graphic drivers, but no luck. The only solution is to set custom scale for windows under 150 % but then other applications become unusable.
Thank you in advance for help
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I am having this same problem and haven't been able to find a solution. Bumping to see if anyone has figured out a solution to this yet or not.

I found the solution:

1) Right click on Houdini application

2)Select Properties

3)Select the Compatibility Tab

4)Select “Change high DPI settings”

5)Towards the bottom check the “High DPI scaling override” box and select “System” in the pull down menu

6) Click OK and Apply and run the application and it should be fixed.